I brush Gucci every night, but for some reason, the matting on her chest is just a nightmare. It's even worse because it is so hard for me to hold the hair while I pull the tangles out AND hold her up at the same time. I've tried flipping her on her back, but she just freaks out because she knows it might hurt.
So, my question is:
Do any of you have your babies in a pupy cut, but have their underside shaved closer?? I don't want her to look completely ridiculous, so I figured I'd see if anyone has an idea or suggestion.

I'm not really any help. Luckily, I haven't really had a matting problem so far with Leila. I brush her at least once a day with her Maden brush and then comb her with her mustache comb. I usually stand her on a counter and with one hand, I hold up her front legs while brushing with the other hand. If she's not in a mood for standing up like that, then I have to blindly do it...brush under there while she stands on all fours where I can't see her tummy/chest. Good luck and maybe some others can give you better tips.

I often "shell out" my dogs with a 10 blade from the armpits back. You really need to commit to teaching her to lay on her back in your lap for grooming. This is the easiest way to brush/trim the chest and belly as well as trim nails and trim the hair between the paw pads.